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UCC283-ADJ Datasheet

  • UCC283-ADJ

  • Low Dropout 3 Ampere Linear Regulator Family

  • 8頁(yè)

  • TI

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UCC283-3/-5/-ADJ
UCC383-3/-5/-ADJ
Low Dropout 3 Ampere Linear Regulator Family
FEATURES
DESCRIPTION
鈥?/div>
Precision Positive Series Pass The UCC283-3/-5/-ADJ family of positive linear series pass regulators are tailored
Voltage Regulation
for low drop out applications where low quiescent power is important. Fabricated
with a BiCMOS technology ideally suited for low input to output differential applica-
鈥?/div>
0.45V Dropout at 3A
tions, the UCC283-5 will pass 3A while requiring only 0.45V of typical input voltage
鈥?/div>
50mV Dropout at 10mA
headroom (guaranteed 0.6V dropout). These regulators include reverse voltage
sensing that prevents current in the reverse direction. Quiescent current is always
鈥?/div>
Quiescent Current Under
less than 650碌A(chǔ). These devices have been internally compensated in such a man-
650碌A(chǔ)
Irrespective of Load
ner that the need for a minimum output capacitor has been eliminated.
鈥?/div>
Adjustable (5 Lead) Output
UCC283-3 and UCC283-5 versions are in 3 lead packages and have preset outputs
Voltage Version
at 3.3V and 5.0V respectively. The output voltage is regulated to 1.5% at room tem-
鈥?/div>
Fixed (3 Lead) Versions for
perature. The UCC283-ADJ version, in a 5 lead package, regulates the output volt-
3.3V and 5V Outputs
age programmed by an external resistor ratio.
鈥?/div>
Logic Shutdown Capability
鈥?/div>
Short Circuit Power Limit of
3%
鈥
IN
鈥?/div>
I
SHORT
鈥?/div>
Low V
OUT
to V
IN
Reverse
Leakage
鈥?/div>
Thermal Shutdown
Short circuit current is internally limited. The device responds to a sustained over-
current condition by turning off after a T
ON
delay. The device then stays off for a pe-
riod, T
OFF
, that is 32 times the T
ON
delay. The device then begins pulsing on and off
at the T
ON
/(T
ON
+T
OFF
) duty cycle of 3%. This drastically reduces the power dissipa-
tion during short circuit and means heat sinks need only accommodate normal op-
eration. On the 3 leaded versions of the device T
ON
is fixed at 750碌s, on the
adjustable 5 leaded versions an external capacitor sets the on time 鈥?the off time
is always 32 times T
ON
. The external timing control pin, CT, on the five leaded ver-
sions also serves as a shutdown input when pulled low.
Internal power dissipation is further controlled with thermal overload protection cir-
cuitry. Thermal shutdown occurs if the junction temperature exceeds 165擄C. The
chip will remain off until the temperature has dropped 20擄C.
The UCC283 series is specified for operation over the industrial range of
鈭?0擄C
to
+85擄C, and the UCC383 series is specified from 0擄C to +70擄C. These devices are
available in 3 and 5 pin TO-220 and TO-263 power packages.
BLOCK DIAGRAM
UDG-98133
SLUS215 - OCTOBER 1998

UCC283-ADJ相關(guān)型號(hào)PDF文件下載

  • 型號(hào)
    版本
    描述
    廠商
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  • 英文版
    Low Dropout 3 Ampere Linear Regulator Family
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    HIGH-EFFICIENCY SYNCHRONOUS BUCK PWM CONTROLLER
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    Low Power Pulse Width Modulator
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    Low Power Pulse Width Modulator
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    Micropower Voltage Mode PWM
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    Micropower Voltage Mode PWM
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    Switch Mode Secondary Side Post Regulator
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    Low Voltage Synchronous Buck Controller
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    Low Voltage Synchronous Buck Controller
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    Brushless DC Motor Controller
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    Brushless DC Motor Controller
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    Source Ringer Controller
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